package io;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * 文件复制
 * 单字节读写
 */
public class CopyDemo {
    public static void main(String[] args) throws IOException {
        //copy
        FileInputStream fis=new FileInputStream("img.png");
        FileOutputStream fos=new FileOutputStream("img_copy.png");
        long start=System.currentTimeMillis();
        while ((fis.read())!=-1){
            fos.write(fis.read());//单字节读写
        }//读写,即复制copy
        long end=System.currentTimeMillis();
        System.out.println("复制完毕，耗时："+(end-start)+"ms");
        fis.close();
        fos.close();


    }
}
